Ireduce_scatter_pure

Ireduce_scatter_pure#

The benchmark for the MPI_Ireduce_scatter function that measures pure communication time. It reduces a vector of length L = X/sizeof(float) float items. The MPI data type is MPI_FLOAT. The MPI operation is MPI_SUM. In the scatter phase, the L items are split as evenly as possible. To be exact, for np number of processes:

L = r*np+s

where

  • r = ⌊L/np⌋

  • s = L mod np

In this case, the process with rank i gets:

  • r+1 items when i<s

  • r items when is

Property

Description

Measuredpattern

MPI_Ireduce_scatter/MPI_Wait

MPI data type

MPI_FLOAT

MPI operation

MPI_SUM

Reportedtimings

Bare time

Reportedthroughput

None